status calc code cleanup

 * Inverted the status calc code order, so that status_calc_bl optionally invokes status_calc_pc/mob/whatever instead of every status_calc_* calling status_calc_bl.
 * Inlined functions status_calc_bl_sub_pc, status_calc_bl_sub_hom and status_calc_bl_sub_mer into status_calc_bl.
 * Restructured status_calc_bl to require as little bl type-specific branching as possible.
 * Split status_calc_bl into two layers - the inner does the battle status calculations, while the outer deals with running appropriate base status calculations, remembering old values and handling client updates.
 * The status_calc_bl function is now the single entry-point for all status calculations.
 * status_calc_bl will now trigger a client update only on attributes that actually changed.
 * If hp or sp changes during status_calc_bl, it will now properly refresh on the client.
 * Removed SCB_PC, now SCB_ALL should be used instead.
 * Revived the unused status calc flag SCB_BASE to indicate that a base status recalculation should be done first (that's what the status_calc_* functions are for).
 * Defined a new symbolic bitmask SCB_BATTLE (SCB_ALL - SCB_BASE) in case someone needs to only calculate the battle status (currently unused).
Please report any issues with this update.

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@13789 54d463be-8e91-2dee-dedb-b68131a5f0ec

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