Use a 32 bit seed for new game seeding in HQ mode. (#4218)

Also adjust some comments

src/main.c

@@ -215,15 +215,37 @@ void SetMainCallback2(MainCallback callback)
 
 void StartTimer1(void)
 {
-    REG_TM1CNT_H = 0x80;
+    if (HQ_RANDOM)
+    {
+        REG_TM2CNT_L = 0;
+        REG_TM2CNT_H = TIMER_ENABLE | TIMER_COUNTUP;
+    }
+
+    REG_TM1CNT_H = TIMER_ENABLE;
 }
 
 void SeedRngAndSetTrainerId(void)
 {
-    u16 val = REG_TM1CNT_L;
-    SeedRng(val);
-    REG_TM1CNT_H = 0;
-    sTrainerId = val;
+    u32 val;
+
+    if (HQ_RANDOM)
+    {
+        REG_TM1CNT_H = 0;
+        REG_TM2CNT_H = 0;
+        val = ((u32)REG_TM2CNT_L) << 16;
+        val |= REG_TM1CNT_L;
+        SeedRng(val);
+        sTrainerId = Random();
+    }
+    else
+    {
+        // Do it exactly like it was originally done, including not stopping
+        // the timer beforehand.
+        val = REG_TM1CNT_L;
+        SeedRng((u16)val);
+        REG_TM1CNT_H = 0;
+        sTrainerId = val;
+    }
 }
 
 u16 GetGeneratedTrainerIdLower(void)

src/random.c

@@ -41,7 +41,8 @@ static void SFC32_Seed(struct Sfc32State *state, u32 seed, u8 stream)
 }
 
 /*This ASM implementation uses some shortcuts and is generally faster on the GBA.
-* It's not necessarily faster if inlined, or on other platforms. */
+* It's not necessarily faster if inlined, or on other platforms.
+* In addition, it's extremely non-portable. */
 u32 NAKED Random32(void)
 {
     asm(".thumb\n\
@@ -49,7 +50,7 @@ u32 NAKED Random32(void)
     mov r6, #11\n\
     ldr r5, =gRngValue\n\
     ldmia r5!, {r1, r2, r3, r4}\n\
-    @ e (result) = a + b + d++\n\
+    @ result = a + b + (d+=STREAM1)\n\
     add r1, r1, r2\n\
     add r0, r1, r4\n\
     add r4, r4, #" STR(STREAM1) "\n\
@@ -59,7 +60,7 @@ u32 NAKED Random32(void)
     @ b = c + (c << 3) [c * 9]\n\
     lsl r2, r3, #3\n\
     add r2, r2, r3\n\
-    @ c = rol(c, 21) + e\n\
+    @ c = rol(c, 21) + result\n\
     ror r3, r3, r6\n\
     add r3, r3, r0\n\
     sub r5, r5, #16\n\