Use 7z to create more efficient ZIP archives

[Calinou]

For a full set of Godot 4.1.1 editor + export template builds, this saves 28 MB without affecting decompression times or archive compatibility. Any ZIP decompression software can decompress these 7z-created ZIP archives; they use the standard DEFLATE algorithm.

Creating archives is expected to be about twice as slow as zip -9, but given the bandwidth and download time savings, it's probably worth it.

For Mono builds, size savings are expected to be even larger as these builds are larger in the first place. Future versions will also logically benefit more from this change, as their binaries expected to keep growing over time.

Note: I haven't tested the script locally, so I advise performing a dry run before merging. Both the machine build-release.sh is run on and the macOS machine used for signing releases must have 7z installed and in PATH. On Ubuntu, this can be done using sudo apt install p7zip-full. On Fedora, this can be done using dnf install p7zip. On macOS, this can be done using brew install sevenzip with Homebrew.

• This closes https://github.com/godotengine/godot-website/issues/120.

Before

Official releases as downloaded from https://downloads.tuxfamily.org/godotengine/4.1.1/.

817,195,141   Godot_v4.1.1-stable_export_templates.tpz
 47,264,118   Godot_v4.1.1-stable_linux.x86_32.zip
 54,436,186   Godot_v4.1.1-stable_linux.x86_64.zip
104,426,977   Godot_v4.1.1-stable_macos.universal.zip
 26,028,541   Godot_v4.1.1-stable_web_editor.zip
 49,422,199   Godot_v4.1.1-stable_win32.exe.zip
 54,161,086   Godot_v4.1.1-stable_win64.exe.zip

After

Official releases downloaded, extracted and recompressed with 7z a -mx9. For the export templates TPZ, both the TPZ itself and ZIP files contained within were recompressed.

797,372,026   Godot_v4.1.1-stable_export_templates.tpz
 46,153,580   Godot_v4.1.1-stable_linux.x86_32.zip
 53,220,111   Godot_v4.1.1-stable_linux.x86_64.zip
101,821,948   Godot_V4.1.1-stable_macos.universal.zip
 25,215,322   Godot_v4.1.1-stable_web_editor.zip
 48,186,220   Godot_v4.1.1-stable_win32.exe.zip
 52,936,912   Godot_v4.1.1-stable_win64.exe.zip

[akien-mga]

Needs rebase after #90. Then I'll test and see if I can merge for the next beta.