Rework tab and context controls

[rmmh]

Description

This commit moves to using L/R consistently for switching between tabs and cleans up the associated text.

Motivation and Context

This is a tiny prerequisite for the Settings tab and the Theme work.

How Has This Been Tested?

This was tested in ares with the necessary SC64 patch.

Screenshots

Types of changes

• Improvement (non-breaking change that adds a new feature)
• Bug fix (fixes an issue)
• Breaking change (breaking change)
• Documentation Improvement
• Config and build (change in the configuration and build system, has no impact on code or features)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

You agree with the license terms and that other license types may be granted with permission of the original N64FlashcartMenu project license holders.

Signed-off-by: rmmh hitchmanr@gmail.com

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[networkfusion]

Still considering this, though the consequence is a change in the general way the joypad was designed to work for most games. It must be considered that most users would either hold it so they have their left hand on the centre stub (with the analogue stick) or the left stub (so using the L button). This was the original reason for making L and Z a single context.