fixed GUI bugs
Added Tree Table

Added two view modes in the main GUI. The variables can either be shown
in tables with an external call stack list, or in a tree table which
contains sub-trees for variables of all functions.
Change view modes by selecting the mode in the menu "view".
implement char to string (C2S)
fix MINUS-bug in interpreter
Merge pull request #26 from pointhi/master

implement C2S and fix bug
Added String Support and Array View on Tree Table mode
Merge pull request #27 from fabian1995/master

Tree Table and String Support in GUI
update clib/math.h
FIX, implement boolean operators
test and fix clib/stdlib.h
FIX, now char can be added and checked if equal with string
little clib improvement
FIX, add \0 to format-characters
test and fix clib/stdio.h and clib/stdlib.h
test and fix libs/math.h
profile info and quest GUI

Added basic GUI for profile info and quest. A quest selection GUI, a
profile selection routine and panel for quick profile and quest info.
Quests and profiles are not yet implemented.

Added breakpoint support in the GUI. Breakpoints are at the moment not
activated.
Merge pull request #28 from pointhi/lib

update clib
Merge pull request #29 from fabian1995/master

profile info and quest GUI
update README.md
Merge pull request #30 from pointhi/master

update README.md