Split Local, Upvalues, Arguments and Globals in dbgProviders

[pablomayobre]

There should be an easy way to split these kinds of variables in setVariables. I have seen IDEs that show different icons next to the variable name depending on the variable type (Local, Upvalue, Argument or Global)

Personally I would use L for local variables, G for global variables, () for arguments, and an up arrow for upvalues.

PS: This should be provided in getVariableChildren as a second argument:

getVariableChildren("full.name.of.the.variable", "global")

Currently I return 4 expandables (Globals, Locals, Upvalues, Arguments)