HAXE-349 New class window fix

This references to http://youtrack.jetbrains.com/issue/HAXE-349

## How it was broken

+ Haxe's official case has changed from "haXe" to "Haxe"
+ All references in plugin were updated by this commit: beec24fd417506c0584d7a9161848990b9c21464
+ Author also renamed file templates, i.e. "haXe Class.hx.ft" -> "Haxe Class.hx.ft"
+ Due to git's strange case sensitive rename handling, that commit actually added "Haxe" files without deleting "haXe" files
+ Until now there were "Haxe" files AND "haXe" files in the repository
+ And for some magical reason, only "haXe" files were always being checked out
+ Plugin was looking for "Haxe" files and didn't find them

## How I fixed it

+ Deleted "Haxe" files AND "haXe" files
+ Added "Haxe" files only

This might seem a little clumsy, but it definitely eliminates the problem.