Catch error thrown when GitHub api ignores a request

Separate PC and Mac shader caches

Bump version to v1.6.0

Use new post shader API

bump version to 1.4.4

Fix bugs in HttpService and bump version number

Closes #10
Closes #11

Normalize title names in search

Closes #9

Misc changes

- Change webhook URL
- Load minimum shader cache version from the server
- Remove LDN build warning
- Clean up some code

Implement shader uploading

Trigger build workflow when a v* tag is pushed