Fix wiimote speaker divisor.

Playing with the wiimote volume in the Wii menu in-game, I found that the range for m_reg_speaker.volume is 0 -127, not 0 - 64.
Merge pull request #1626 from kamiyo/fix-wiimote-volume-divisor

Fix Wiimote speaker divisor for format 0x00
Fixed some styling stuff (whitespace and brackets)

Moved #defines to static const (did I do it right?)
Moved inline fx's to header file
changed math.h to cmath
Merge https://github.com/dolphin-emu/dolphin into personal

Conflicts:
	Source/Core/Core/HW/WiimoteEmu/Speaker.cpp