Beta 1.0.3

Fixed QComboBox drop-down right border on Linux, fixed code style

fix: QComboBox drop-down right border on Linux
build: bump version to 1.0.3
style: fix W0102, W1201, W1309, W0404, C0209

This is a beta version. Serious bugs are possible!

Compiled binaries are built by hand for Windows/Linux AMD64 only. In the future this will be automated. (so other platforms have not been tested yet)