Flag max number of local variables

Nobody has claimed this yet.

There seems to be a limit of 253 variables allowed in a function (including parameters). We should flag this.

Here's a piece of test code showing the issue

function testIf()
  var1 = 1
  var2 = 2
  var3 = 3
  var4 = 4
  var5 = 5
  var6 = 6
  var7 = 7
  var8 = 8
  var9 = 9
  var10 = 10
  var11 = 11
  var12 = 12
  var13 = 13
  var14 = 14
  var15 = 15
  var16 = 16
  var17 = 17
  var18 = 18
  var19 = 19
  var20 = 20
  var21 = 21
  var22 = 22
  var23 = 23
  var24 = 24
  var25 = 25
  var26 = 26
  var27 = 27
  var28 = 28
  var29 = 29
  var30 = 30
  var31 = 31
  var32 = 32
  var33 = 33
  var34 = 34
  var35 = 35
  var36 = 36
  var37 = 37
  var38 = 38
  var39 = 39
  var40 = 40
  var41 = 41
  var42 = 42
  var43 = 43
  var44 = 44
  var45 = 45
  var46 = 46
  var47 = 47
  var48 = 48
  var49 = 49
  var50 = 50
  var51 = 51
  var52 = 52
  var53 = 53
  var54 = 54
  var55 = 55
  var56 = 56
  var57 = 57
  var58 = 58
  var59 = 59
  var60 = 60
  var61 = 61
  var62 = 62
  var63 = 63
  var64 = 64
  var65 = 65
  var66 = 66
  var67 = 67
  var68 = 68
  var69 = 69
  var70 = 70
  var71 = 71
  var72 = 72
  var73 = 73
  var74 = 74
  var75 = 75
  var76 = 76
  var77 = 77
  var78 = 78
  var79 = 79
  var80 = 80
  var81 = 81
  var82 = 82
  var83 = 83
  var84 = 84
  var85 = 85
  var86 = 86
  var87 = 87
  var88 = 88
  var89 = 89
  var90 = 90
  var91 = 91
  var92 = 92
  var93 = 93
  var94 = 94
  var95 = 95
  var96 = 96
  var97 = 97
  var98 = 98
  var99 = 99
  var100 = 100
  var101 = 101
  var102 = 102
  var103 = 103
  var104 = 104
  var105 = 105
  var106 = 106
  var107 = 107
  var108 = 108
  var109 = 109
  var110 = 110
  var111 = 111
  var112 = 112
  var113 = 113
  var114 = 114
  var115 = 115
  var116 = 116
  var117 = 117
  var118 = 118
  var119 = 119
  var120 = 120
  var121 = 121
  var122 = 122
  var123 = 123
  var124 = 124
  var125 = 125
  var126 = 126
  var127 = 127
  var128 = 128
  var129 = 129
  var130 = 130
  var131 = 131
  var132 = 132
  var133 = 133
  var134 = 134
  var135 = 135
  var136 = 136
  var137 = 137
  var138 = 138
  var139 = 139
  var140 = 140
  var141 = 141
  var142 = 142
  var143 = 143
  var144 = 144
  var145 = 145
  var146 = 146
  var147 = 147
  var148 = 148
  var149 = 149
  var150 = 150
  var151 = 151
  var152 = 152
  var153 = 153
  var154 = 154
  var155 = 155
  var156 = 156
  var157 = 157
  var158 = 158
  var159 = 159
  var160 = 160
  var161 = 161
  var162 = 162
  var163 = 163
  var164 = 164
  var165 = 165
  var166 = 166
  var167 = 167
  var168 = 168
  var169 = 169
  var170 = 170
  var171 = 171
  var172 = 172
  var173 = 173
  var174 = 174
  var175 = 175
  var176 = 176
  var177 = 177
  var178 = 178
  var179 = 179
  var180 = 180
  var181 = 181
  var182 = 182
  var183 = 183
  var184 = 184
  var185 = 185
  var186 = 186
  var187 = 187
  var188 = 188
  var189 = 189
  var190 = 190
  var191 = 191
  var192 = 192
  var193 = 193
  var194 = 194
  var195 = 195
  var196 = 196
  var197 = 197
  var198 = 198
  var199 = 199
  var200 = 200
  var201 = 201
  var202 = 202
  var203 = 203
  var204 = 204
  var205 = 205
  var206 = 206
  var207 = 207
  var208 = 208
  var209 = 209
  var210 = 210
  var211 = 211
  var212 = 212
  var213 = 213
  var214 = 214
  var215 = 215
  var216 = 216
  var217 = 217
  var218 = 218
  var219 = 219
  var220 = 220
  var221 = 221
  var222 = 222
  var223 = 223
  var224 = 224
  var225 = 225
  var226 = 226
  var227 = 227
  var228 = 228
  var229 = 229
  var230 = 230
  var231 = 231
  var232 = 232
  var233 = 233
  var234 = 234
  var235 = 235
  var236 = 236
  var237 = 237
  var238 = 238
  var239 = 239
  var240 = 240
  var241 = 241
  var242 = 242
  var243 = 243
  var244 = 244
  var245 = 245
  var246 = 246
  var247 = 247
  var248 = 248
  var249 = 249
  var250 = 250
  var251 = 251
  var252 = 252
  var253 = 253
  var254 = 254
end function

Variable names are hoisted into the symbol table at compile-time, so even variables defined in will-never-be-executed if blocks will count against this limit.

Reproduce the issue with the BrightScript function shown in the report, then trace the compiler's symbol-table handling and diagnostic path. Done means functions exceeding 253 variables, including parameters and variables in unreachable branches, produce a clear compiler diagnostic instead of compiling silently.

Written by the indexing model from the issue text.

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