[low-priority] [autoauto] Fix compiling after a gitignore

[chlohal]

When the compiler checks for robot functions (autoauto/compiler/functionloader/index.js), it should check if the robotfunctions directory exists. If it doesn't, the cache file should automatically be deleted.

This fixes a problem where the compiler assumes deleted files still exist since the cache hasn't changed.

For whoever does this, make sure to do it before line 14, since that's what loads the cache file.

[chlohal]

For now, we can work around this by manually deleting the autoauto/compiler/functionloader/.cache directory