Library/Se/Project: Implement SePlayParam

[c4nvm]

implements all of SePlayParam.o for #2034. ctor, reset, set, setMul, plus the header and cpp.

al::SePlayParam is a 12 byte SE param entry: SePlayParamType mType (0x0), f32 mValue (0x4, default 1.0f), f32 mValue2 (0x8, default 0.0f). ctor and reset default to invalid/1.0/0.0, set overwrites all three, setMul swaps type + mValue2 and multiplies mValue.

enum comes from the switch in conveyParamListToHandle, which maps each type to an AcLSoundHandle setter. that's what tells me mValue is the main operand and mValue2 is the secondary index for the seq variable and biquad cases. invalid(0), volume(1), pitch(2), seqTempoRatio(3), effectSend(4), seqLocalVariable(5), seqGlobalVariable(6), lpfFreq(7), biquadFilter(8).

setMul needed an explicit temp float or the multiply wouldn't match. method/class names are from mangled symbols, field and enum names are inferred so flag anything off.

---

This change is 

---

Report for 1.0 (ae6bf40 - 4f8b41d)

📈 Matched code: 15.32% (+0.00%, +72 bytes)

✅ 4 new matches

Unit	Item	Bytes	Before	After
Library/Se/Project/SePlayParam	al::SePlayParam::setMul(al::SePlayParamType, float, float)	+24	0.00%	100.00%
Library/Se/Project/SePlayParam	al::SePlayParam::SePlayParam()	+16	0.00%	100.00%
Library/Se/Project/SePlayParam	al::SePlayParam::reset()	+16	0.00%	100.00%
Library/Se/Project/SePlayParam	al::SePlayParam::set(al::SePlayParamType, float, float)	+16	0.00%	100.00%

[MonsterDruide1]

@MonsterDruide1 reviewed 3 files and all commit messages, and made 3 comments.
Reviewable status: all files reviewed, 3 unresolved discussions (waiting on c4nvm and MonsterDruide1).

---

lib/al/Library/Se/Project/SePlayParam.h line 7 at r1 (raw file):

namespace al {

enum class SePlayParamType {

TODO: check this

---

lib/al/Library/Se/Project/SePlayParam.cpp line 13 at r1 (raw file):

    mValue = 1.0f;
    mValue2 = 0.0f;
}

... and put those default values in the header.
Not sure if this matches.

Suggestion:

SePlayParam::SePlayParam() = default;

void SePlayParam::reset() {
    *this = {};
}

---

lib/al/Library/Se/Project/SePlayParam.cpp line 25 at r1 (raw file):

    mType = type;
    mValue2 = value2;
    mValue = mul;

might match, not sure

Suggestion:

    mType = type;
    mValue *= mul;
    mValue2 = value2;