Fold debugger monkey patching into Theme

debugger code contains:

```
cst = self.color_scheme_table

cst['NoColor'].colors.prompt = C.NoColor
cst['NoColor'].colors.breakpoint_enabled = C.NoColor
cst['NoColor'].colors.breakpoint_disabled = C.NoColor

cst['Linux'].colors.prompt = C.Green
cst['Linux'].colors.breakpoint_enabled = C.LightRed
cst['Linux'].colors.breakpoint_disabled = C.Red

cst['LightBG'].colors.prompt = C.Blue
cst['LightBG'].colors.breakpoint_enabled = C.LightRed
cst['LightBG'].colors.breakpoint_disabled = C.Red

cst['Neutral'].colors.prompt = C.Blue
cst['Neutral'].colors.breakpoint_enabled = C.LightRed
cst['Neutral'].colors.breakpoint_disabled = C.Red

```

Is should be just move to where the colors are defined.