1) some size_t replaced with uint - does it now compile under Alpha??

1) some size_t replaced with uint - does it now compile under Alpha??
2) added Matches(const char *mask) function which checks if the string
   matches the mask possibly containing '?' and '*' wildchars
3) GetWriteBuf complemented with UngetWriteBuf

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@198 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775