Hash context module uses digit as loop variable

[Siorki]

Issue obtained on benchmark file 2016 - Voxeling.js with settings :

	withMath : false,
	hash2DContext : true,
	hashWebGLContext : true,
	hashAudioContext : true,
	contextVariableName : 'c',
	contextType : 0,
	reassignVars : true,
	varsNotReassigned : 'abcdg',
	crushGainFactor : 1.0,
	crushLengthFactor : 0.0,
	crushCopiesFactor : 0.0,
	crushTiebreakerFactor : 1,
	wrapInSetInterval : false,
	timeVariableName : ""

The hashing loop uses 2 as variable for both 2D names and 2D properties :

for(2 in c)c[2[2]+[2[5]]]=c[2];
for(2 in c)c[2[0]+[2[6]]]=2;

Of course the resulting code does not work.
The reason for that behavior is that the original code contains for(2==m so 2 is considered as a potential loop variable, along with k, p and s, and the first one in ASCII order is chosen.

[Siorki]

Solution : change the RegExp that matches for(variable to only consider valid variable names (no digits).

[Siorki]

Replaced \w in regex by [A-Za-z$_]