all: fix declarations and types for symbols

[MonsterDruide1]

typedef results in the typedef-ed type appearing in the signature, instead of the name of the newly defined "type".
The easiest way to fix that is by creating full structs instead of only aliases, even if they only contain one member then.

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This change is 

[german77]

@german77 reviewed 8 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on MonsterDruide1).

[MonsterDruide1]

I should actually check whether the project compiles... we don't have a nice workflow for that here, compared to sead.

@german77 Please re-approve.

[german77]

@german77 reviewed 2 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on MonsterDruide1).