cmake: do not require GR 3.7
move flow graphs to gr app directory
cmake: use glob instead of individual files for grc dir
grc: category name rstt -> RSTTT
add wx panel
add python files from cli dir to gr
work on gui
panel: fix toolbar
panel: multi line plot
move everything to toplevel directory
del cli folder
adapt install
del gr-rstt dir
readme: add link to wiki
del vimrc and most stuff from gitignore