Update command lists to latest for every repository

Uses commits:

termux-packages      https://github.com/termux/termux-packages/tree/1d8abfa
game-packages        https://github.com/termux/game-packages/tree/801daec
science-packages     https://github.com/termux/science-packages/tree/030021d
termux-root-packages https://github.com/termux/termux-root-packages/tree/601147e
unstable-packages    https://github.com/termux/unstable-packages/tree/922b296
x11-packages         https://github.com/termux/x11-packages/tree/0d365c7

Update command lists to latest for each repository

Uses commits:

termux-packages      https://github.com/termux/termux-packages/tree/a4a2b64
game-packages        https://github.com/termux/game-packages/tree/74c021d
science-packages     https://github.com/termux/science-packages/tree/19027d8
termux-root-packages https://github.com/termux/termux-root-packages/tree/0ea305a
unstable-packages    https://github.com/termux/unstable-packages/tree/478d0d4
x11-packages         https://github.com/termux/x11-packages/tree/b80dc5c

Fix bug causing removed packages to remain in lists

Also update all command lists

Update commands

Update termux-packages, x11-packages, unstable-packages and game-packages

Update command lists to latest for each repository

Uses commits:

termux-packages https://github.com/termux/termux-packages/tree/7337720
game-packages https://github.com/termux/game-packages/tree/3dcb88d
science-packages https://github.com/termux/science-packages/tree/ed28bce
termux-root-packages https://github.com/termux/termux-root-packages/tree/21e6481
unstable-packages https://github.com/termux/unstable-packages/tree/b779f2a
x11-packages https://github.com/termux/x11-packages/tree/c578742

Special release for Android 5/6 packages

1.42.1

initialize android-5 branch

Fix install location of command-not-found

Change so that command-not-found is installed to $PREFIX/libexec/termux instead of $PREFIX/bin

Missing install instruction added

An install instruction was added to the CMakeLists.txt.

Support for multiple repos

Command-not-found has been rewritten in c++ and can now handle multiple repos. Suggestions are shown in this format:

No command shark found, did you mean:
 Command shar in package sharutils
 Command tshark in package tshark from the root-repo repository
 Command sharkd in package wireshark-gtk from the x11-repo repository