shebang:
Move parameters from set.
Add newline after for consistency.
curl:
Add -f;
Prevents output on error.
Use -O where applicable;
-o with the same filename as the URL is pointless.
Add -S after -s:
Makes curl still error despite being silent.
build-symbols:
Add zip fallback.
get-discord-rpc:
Move git clone parameters before repository for readability.
Use --depth 1 to speed up cloning.
install-nsis:
Use ProgramData environment variable.
build-appimage-docker.sh:
Add -e to docker run.
Run script directly.
build-appimage.sh:
Make if more consistent.
Remove unused Travis scripts.
setenv:
unset instead of blanking variables.
vstool.cmd:
Use ProgramFiles(x86) environment variable.
