Edit Templates with data, after mod directory is created

Create an easy way to make templates variable.

For *mod_main.gd*:

```gdscript
const MOD_DIR := "AuthorName-ModName"
const MODNAME_LOG_NAME := "AuthorName-ModName
```

```gdscript
const {%MOD_NAME%}_MOD_DIR := "{%NAMESPACE%}-{%NAME%}"
const {%MOD_NAME%}_LOG_NAME := "{%NAMESPACE%}-{%NAME%}"
```