macos: Set `GDK_PIXBUF_MODULEDIR`

It seems by default the Homebrew binary ends up using the package-specific
directory, so this finds the default loaders but not the one from the
librsvg package.

Merge pull request #219 from pop-os/1.3.10

Update version to 1.3.10

1.3.9

linux: Fix AppImage build (#207)

It seems the filename of the generated AppImage was changed after an
update to `LinuxDeploy`. Easy enough to fix.

Merge pull request #202 from pop-os/bump-1.3.7

Bump version to 1.3.7

Merge pull request #194 from pop-os/1.3.6

Bump version to 1.3.6

Merge pull request #192 from pop-os/1.3.5

Bump version to 1.3.5

Update launch_2 and launch_heavy_1 firmware blobs

Added support for galp7 and lemp12