Update how the docset is generated.

Use a more human-friendly name,
put the files in doxygen/out/docset instead of in html,
etc.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76329 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add some missing wxGrid methods

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76330 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Avoid possible infinite recursion

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76331 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add the CellHighlight getters too.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76332 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775