Reevaluate player knockback types names

[Dragorn421]

Followup to #2640

I expect this to be less consensual and am open to suggestions or even just closing if no consensus can be reached.

[mzxrules]

PlayerKnockType isn't quite right, but I don't have anything immediately popping off the top of my head that makes sense. Like to me this is how it should be, I just don't know what word fits the ? slot.

typedef enum Player?Type {
    /* 0 */ PLAYER_?_NONE, // No ?
    /* 1 */ PLAYER_?_KNOCKBACK, // A small hop, remains standing up
    /* 2 */ PLAYER_?_KNOCKDOWN, // Sent flying in the air and lands laying down on the floor
    /* 3 */ PLAYER_?_KNOCKDOWN_ELECTRIFIED // Same as `PLAYER_?_KNOCKDOWN` with a shock effect
} Player?Type;

And just a pin for later, don't forget to update the function names in z_actor.c and the player->knockback* variables if/when you have a better idea on how to move forward with this.

[Dragorn421]

Updated to PLAYER_BUMP_KNOCKBACK, PLAYER_BUMP_KNOCKDOWN, Actor_SetPlayerBump*, Player.bump*

[Dragorn421]

https://discord.com/channels/688807550715560050/838852326231769089/1389565332837896322