Some major updates including heuristics

- Allow to define heuristics in heuristics.yaml
- Migrate all filetypes from vim beginning with "a"
- Remove enhanced cpp syntax (it was too slow to load)
- Use setf instead of set ft for setting filetype (faster)
- Override native hauristics with au!
- Add globbing of files for packages
- Replace predefined dirs with extra_dirs and ignored_dirs
- Allow to define proper order of packages with topological sort
- Fix powershell detection
- Lint and fix many packages.yaml issues
- etc etd

syntax/ave.vim

@@ -0,0 +1,83 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'ave') == -1
+
+" Vim syntax file
+" Copyright by Jan-Oliver Wagner
+" Language:	avenue
+" Maintainer:	Jan-Oliver Wagner <Jan-Oliver.Wagner@intevation.de>
+" Last change:	2001 May 10
+
+" Avenue is the ArcView built-in language. ArcView is
+" a desktop GIS by ESRI. Though it is a built-in language
+" and a built-in editor is provided, the use of VIM increases
+" development speed.
+" I use some technologies to automatically load avenue scripts
+" into ArcView.
+
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
+  finish
+endif
+
+" Avenue is entirely case-insensitive.
+syn case ignore
+
+" The keywords
+
+syn keyword aveStatement	if then elseif else end break exit return
+syn keyword aveStatement	for each in continue while
+
+" String
+
+syn region aveString		start=+"+ end=+"+
+
+" Integer number
+syn match  aveNumber		"[+-]\=\<[0-9]\+\>"
+
+" Operator
+
+syn keyword aveOperator		or and max min xor mod by
+" 'not' is a kind of a problem: It's an Operator as well as a method
+" 'not' is only marked as an Operator if not applied as method
+syn match aveOperator		"[^\.]not[^a-zA-Z]"
+
+" Variables
+
+syn keyword aveFixVariables	av nil self false true nl tab cr tab
+syn match globalVariables	"_[a-zA-Z][a-zA-Z0-9]*"
+syn match aveVariables		"[a-zA-Z][a-zA-Z0-9_]*"
+syn match aveConst		"#[A-Z][A-Z_]+"
+
+" Comments
+
+syn match aveComment	"'.*"
+
+" Typical Typos
+
+" for C programmers:
+syn match aveTypos	"=="
+syn match aveTypos	"!="
+
+" Define the default highlighting.
+" Only when an item doesn't have highlighting+yet
+
+hi def link aveStatement		Statement
+
+hi def link aveString		String
+hi def link aveNumber		Number
+
+hi def link aveFixVariables	Special
+hi def link aveVariables		Identifier
+hi def link globalVariables	Special
+hi def link aveConst		Special
+
+hi def link aveClassMethods	Function
+
+hi def link aveOperator		Operator
+hi def link aveComment		Comment
+
+hi def link aveTypos		Error
+
+
+let b:current_syntax = "ave"
+
+endif