Transfer updated setup process from rastools
Remove redundant stuff from setup.cfg
Removed LICENSE.txt, Makefile generates it now
Bring docs up to date

Version derived from packaged source, installation instructions just
provide link to the website, etc. etc.
Add Makefile and structures to generate PNG icons
Merged generic TerminalApplication from rastools

This is now the base of all oxitop command line applications. The merge
also takes care of several outstanding issues (mostly command line
parsing related but also error handling)
Minor changes

Re-jigging the base classes so they inherit from OxiTopApplication which
now inherits from TerminalApplication
Renamed oxitopview package to windows

In preparation for adding the oxitopdump.oxitopview module. This is for
compatibility with the new Pyinstaller-based windows build method being
ported from rastools.