Plugins: Avoided taking an audio callback lock when initialising plugins to avoid hangs in the audio thread

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Unit Test Results

       3 files  ±0         3 suites  ±0   0s :stopwatch: ±0s    158 tests ±0     158 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  6 153 runs  ±0  6 153 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit d90724f1. ± Comparison against base commit e6ec627f.

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Performance Test Results

0 files  ±0  0 suites  ±0   0s :stopwatch: ±0s 0 tests ±0  0 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit d90724f1. ± Comparison against base commit e6ec627f.