This imports the brand new SourcePawn compiler. The new compiler is much
faster to compile and generates significantly improved code around
array generation and array access.
There are a number of compatibility changes in the new compiler. Most of
these are due to improved type checking and error detection. The full
list of notes can be found here:
https://github.com/alliedmodders/sourcepawn/blob/master/docs/upgrading-1.11.md
Additionally, .smx files generated by the new compiler will NOT load on
earlier versions of SourceMod, including earlier versions of 1.11. Old
plugins will continue to load as normal.