Remove obsolete and unused code

[JohnTheGr8]

• clear all Obsolete code from Flow.Launcher.Plugin package
• clear old backwards compatibility code
• delete left-over files (from the Wox repo)
• added AccelerateBuildsInVisualStudio to all projects to speed up local builds

[github-actions]

@check-spelling-bot Report

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Unrecognized words (14)

Arguements
cretain
eror
google
hashcode
iexplore
metadatas
NUnit
refeshes
Reloadable
requerying
seperated
spefic
splited

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Errors (1)

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❌ Errors	Count
❌ forbidden-pattern	1

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[JohnTheGr8]

Relevant question @Flow-Launcher/team : is there anything in the Plugin project that we might want to mark obsolete and phase out in the future?

[jjw24]

Not that I am aware of.