Changed Process functionality from plugin to an internal measure

[thatsIch]

Added August 24, 2020 - Revision 3403

Process: Changed the Process functionality from a plugin to an internal measure. This also corrects an issue with "timing" when instances of Process was used in multiple skins.

https://docs.rainmeter.net/manual/measures/process/

It was previously

[MeasureParent]
Measure=Plugin
Plugin=Process
or
Plugin=Process.dll
or
Plugin=Plugins\Process.dll

but from now on it should be written as the following

[MeasureParent]
Measure=Process

as written in the documentation