[PATCH v2] winecfg: don't trash app names

[Rafał Mużyło]

 Currently, if app name isn't representable in CP_ACP, it gets trashed
 during creation. There's no reason for it - the name is originally
 retrived as widechar string. This isn't the cleanest way, but still one
 that works.

 gothas: enumerate_values is no longer usable for other maens, yet this
 was its only use; reg_key_exists becomes unused; {g,s}et_app_reg_key
 copy a lot of existing code, instead of reusing

 minor note: winecfg could use a better check for KEY_WOW64_32KEY case -
 in my experience, it's quite often that key created by winecfg should
 actually under Wow6432Node, otherwise it has no effect.

 v2: no real changes, just a cast to silence a warning and a non-patch
 bit I've missed

Signed-off-by: Rafał Mużyło <galtgendo at o2.pl>

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