Add some missing Savemap fields, introduce fix_structs script

[maciej-trebacz]

This PR does several things:

1. Renames _work to Savemap and fills in some missing fields in the struct
2. Adds a --fix-structs optional flag (can make it enabled by default later if you see value in it) that will automatically fix references to Savemap in the decompiled code

I've tested this on two world functions as a demonstraction of the above flag. This is what the script outputs (no manual adjustment necessary)

void func_800B77F4(s32 arg0)
{
    Savemap.countdown_timer_seconds = arg0;
    D_80116278 = 1;
    Savemap.memory_bank_1[95] = 1;
}

void func_800B7820(void)
{
    D_80116278 = 0;
    Savemap.memory_bank_1[95] = 0;
}

I've tried to bundle this with this PR but the build was failing with checksum errors, I don't know how to fix it though 🙂

[Xeeynamo]

Looks good + script to fix savemap structs is an excellent idea. Thank you!