Deprecate permission methods which do not handle overwrites (#3037) #996

Job	Run time
Examples	3m 19s
Build docs	29s
Test (macOS)	1m 44s
MSRV	37s
Check minimal versions	39s
Test (nightly)	3m 8s
Test (stable)	3m 39s
Test (beta)	2m 59s
Test (Windows)	4m 51s
Test (native-tls)	2m 49s
Test (no default features)	41s
Test (no cache)	2m 51s
Test (no gateway)	1m 40s
Test (unstable Discord API features)	3m 5s
Test (simd-json)	3m 5s
Test (chrono, chrono)	42s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 12s
Test (builder without model, builder, true)	27s
Test (unstable Discord API (no default features), unstable_discord_api, true)	27s
	38m 24s

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