Changes target TURN_DAMAGED and MAX_HP to inlines

[AlexOn1ine]

Merges TARGET_TURN_DAMAGED and BATTLER_TURN_DAMAGED and converts them to a static inline.

Changes BATTLER_MAX_HP to a static inline

Things to note in the release changelog:

• When converting TARGET_TURN_DAMAGED, gBattlerTarget needs to be used as the argument. BATTLER_TURN_DAMAGED gets the corresponding argument that is passed into the macro. Same with BATTLER_MAX_HP.

[Pawkkie]

I LOVE this change, anytime we can shift macros to functions it feels like I get a pair of glasses the legibility is so much better lol

[Pawkkie]

I have one more comment actually, with your release note for users. For the automated system to pick that up for the changelog, it needs to be formatted differently, as per the new PR template.

<!-- We use an automated system to generate our changelogs, so if there's something of note that our end users should know in regards to this change besides the title of this PR, they should be added here. -->
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so could you paste this into your PR description instead

## Things to note in the release changelog:
- When converting TARGET_TURN_DAMAGED, gBattlerTarget needs to be used as the argument. BATTLER_TURN_DAMAGED gets the corresponding argument that is passed into the macro. Same with BATTLER_MAX_HP.