Decent testnet/regtest logo/icon colours (#27)
Replaces the old hue shift code with a new colourised greyscale algorithm.
The new testnet colours match the existing bitcoin_noletters_testnet.png which was already used for one of the icons on Windows. (I basically reverse-engineered how I made that.)
Fixes #27 (closed)
Some code was reformatted following our Lead Maintainer's decision to abolish the 80-char line limit.
Tested as follows:
- Launch the node on each network (mainnet, testnet, regtest).
- Check splash screen and verify system tray icon has same colours.
Edited by BigBlockIfTrue