uConvert 1.01

• fixed -bpp 24 export (thanks to @lpgb for reporting!)
• added links to some interesting projects in README.md
• Makefile doesn't override compiler flags, making life easier for package managers (hi @jurajlutter :))

For uConvert building & usage, see: https://github.com/mikrosk/uconvert/blob/v1.01/README.md

No changes for uShow, please refer to https://github.com/mikrosk/uconvert/releases/tag/v1.00 for download & usage.