1.5 Update

[APickledWalrus]

• A lot of syntax has been merged, which should reduce repetition "placeholderapi" or "mvdwplaceholderapi"
• Overall size has been reduced due to a reduction in files
• The colorize option now works on any placeholder
• OfflinePlayer support has been improved for PlaceholderAPI
• Fixes #9
• GitHub Actions now creates an artifact for each build (needs fixed)
• A lot of refactoring
• Moved the utility parts of ExprParsePlaceholder to their own file
• Added ability to listen to multiple prefixes / placeholders in one event (this registers a placeholder for each prefix)
• PlaceholderAPI placeholders now persist on /papi reload

Opening this as a PR because testing needs done.

(p.s. ignore the branch name haha)