Update to v106r15 release.

byuu says:

Changelog:

  - main menu renamed again (Library→System→Systems)
  - the 'Hidden' checkbox on system properties was moved to the main
    list as a 'Show' checkbox instead
  - the move up/move down buttons on the systems panel now function
  - added icons to indicate 'system' versus 'game boot' entries in the
    systems list

I still didn't add ComboEdit to the Windows hiro port, so once again
this will be Linux/BSD only.

I polished the browse button for selecting a boot game. It'll use a list
of all bootable media file extensions, so that if you double-click any
supported game, it'll select it instead of going inside the folder. If
you pick a non-bootable folder, like say a Sufami Turbo cartridge, it
will go inside the folder instead, because it will treat it like any
other regular folder.

Having a checkbox next to text in the same cell doesn't work so well on
lists that have an onActivate action. Say you tried to double-click the
“Name” field on the Systems tab, it would toggle the checkbox twice
before popping open the system properties editor window. So because of
this, I made the show checkbox its own column. And for consistency, I
did the same for the slot# on the cheat editor window.

As a bit of really pedantic polish: if there are no systems enabled,
then the main menu won't show the separator before the “Load ROM Image”
option anymore.

I think something is wrong with the Markup::Node::insert syntax, but I
realized I have Markup::Node::swap, and just used that for the up/down
arrows on the systems panel for now. But we should probably fix insert()
at some point ... sigh.

hiro/gtk/widget/table-view.cpp

@@ -153,7 +153,7 @@ auto pTableView::_cellWidth(unsigned _row, unsigned _column) -> unsigned {
   if(auto item = self().item(_row)) {
     if(auto cell = item->cell(_column)) {
       if(cell->state.checkable) {
-        width += 24;
+        width += 16 + (cell->state.icon || cell->state.text ? 4 : 0);
       }
       if(auto& icon = cell->state.icon) {
         width += icon.width() + 2;