refactor: Naming standardization

[DaveSkender]

done when

• Rename GetIndex utility methods
• Add [Obsolete] aliases for GetEma() to ToEma()
• Add [Obsolete] aliases for Tuple variants
• Other naming updates

Copilot reviewed 6 out of 13 changed files in this pull request and generated no suggestions.

Files not reviewed (7)

• src/_common/Observables/StreamHub.cs: Evaluated as low risk
• src/a-d/Alligator/Alligator.StreamHub.cs: Evaluated as low risk
• src/m-r/Renko/Renko.StreamHub.cs: Evaluated as low risk
• tests/indicators/_common/Observables/StreamHub.Utilities.Tests.cs: Evaluated as low risk
• src/a-d/Adl/Adl.StreamHub.cs: Evaluated as low risk
• src/a-d/AtrStop/AtrStop.StreamHub.cs: Evaluated as low risk
• src/s-z/Sma/Sma.StreamHub.cs: Evaluated as low risk

Comments skipped due to low confidence (2)

src/a-d/Atr/Atr.StreamHub.cs:75

• [nitpick] The variable name 'i' is ambiguous. It should be renamed to 'index'.

int i = indexHint ?? ProviderCache.IndexOf(item, true);

src/s-z/Tr/Tr.StreamHub.cs:54

• [nitpick] The variable name 'i' is ambiguous. It should be renamed to 'index'.

int i = indexHint ?? ProviderCache.IndexOf(item, true);

Copilot reviewed 9 out of 23 changed files in this pull request and generated no suggestions.

Files not reviewed (14)

• src/Indicators.csproj: Language not supported
• src/_common/Observables/StreamHub.cs: Evaluated as low risk
• src/a-d/Alligator/Alligator.StreamHub.cs: Evaluated as low risk
• tests/indicators/m-r/ParabolicSar/ParabolicSar.StaticSeries.Tests.cs: Evaluated as low risk
• src/m-r/ParabolicSar/ParabolicSar.StaticSeries.cs: Evaluated as low risk
• src/m-r/Renko/Renko.StreamHub.cs: Evaluated as low risk
• tests/indicators/_common/Observables/StreamHub.Utilities.Tests.cs: Evaluated as low risk
• src/_common/ObsoleteV3.cs: Evaluated as low risk
• src/s-z/StdDevChannels/StdDevChannels.StaticSeries.cs: Evaluated as low risk
• src/s-z/Sma/Sma.StreamHub.cs: Evaluated as low risk
• src/a-d/Adl/Adl.StreamHub.cs: Evaluated as low risk
• src/e-k/Ema/Ema.StreamHub.cs: Evaluated as low risk
• src/a-d/AtrStop/AtrStop.StreamHub.cs: Evaluated as low risk
• tests/indicators/e-k/Kvo/Kvo.StaticSeries.Tests.cs: Evaluated as low risk