Translate debug info

[abc4857]

I added support for translating debug info (line numbers, local variable names, types and signatures and parameter names) from dex to jar. It is enabled by using the --debug flag.

[abc4857]

The output is correct but if you're using Procyon there's a bug that causes a NullPointerException when there's instructions between the first store to a register and the LocalVariableTable entry start_pc of the variable (I reported it here). A workaround that solves many (but not all) of these errors is replacing line 2684 in AstBuilder.java with:

if ((vDef == null || (vDef.getScopeStart() != -1 && vDef.getScopeEnd() != -1)) 
    && b.operand instanceof VariableReference
    && variablesMatch(vRef, (VariableReference) b.operand)) {

[Storyyeller]

I don't feel comfortable merging this without having spent time personally testing it, but you're welcome to tell people to use your branch if they want debug info.