This is part 2 for 5f084cd9

Other improvements:

* Use the defined ItemGroupList when used
* make Client::checkPrivilege const
* inline some trivial functions
* Add ActiveObjectMap typedef
* Add SettingsEntries typedef

For consistent horizontal sprite structure when seen from front and back
Fix code style

Adds initial ingame gamepad support to minetest.

Full Formspec support is not implemented yet and
can be added by a later change.

* Sky: rename Box => m_box and inline getBoundingBox
* Uniformize aabbox3d<f32> to aabb3f

Non const references cause a lot of confusion with behaviour of code,
and are disallowed by minetest style guide.

This reverts commit 91bafcee.

Reverted due to missinterpretation of agreement, obvious dislike and me not interested in doing fights for feature I don't actually need

or change the nametag text of players

- Disabled by default (except players)
- Fixes #2984

Commit

d2ca6625 "Enforce hiding nametag"

didn't fix the issue for "client" instances, where the nametag update
was received before the object was added to the scene. This resulted
in the grey shadow on the nametag that commit tried to fix.

Thanks to @neoascetic for pointing out that there still is a shadow.

These names are reserved for the compiler/library implementations.

Remove DTIME macro and its uses, too

Use wide_to_utf8 and utf8_to_wide instead of wide_to_narrow and narrow_to_wide at almost all places.
Only exceptions: test functions for narrow conversion, and chat, which is done in a separate commit.

-> remove the old parent as @kahrl suggested
-> use indices no iterator as @kwolekr suggested

* Use enum for GENERIC_CMD_*
* Rename m_attachements to attachement_parent_ids (public member and clearer name)
* Rename GENERIC_CMD_SET_ATTACHMENT to GENERIC_CMD_ATTACH_TO
* USHRT_MAX + 1 buffer sizes to prevent overflows as @kahrl suggested
* Remove unneccessary m_id from GenericCAO (shadowing protected superclass member for no reason) as @kahrl suggested

This allows newer versions to add additional information that isn't
read by us, but still in a backwards compatible manner.

Work around irrlicht bug and hide nametag if its alpha is set to 0.
Thanks @TeTpaAka for pointing out workaround.

Commit 11a96e49
commented out version parsing, resulting in the version byte being parsed as part of the color,
making nametags dark grey.
Re-introduces version parsing and ignores the packet if the version is more recent than ours,
fixing the unused variable warning (should have been done anyway).

Move debug streams to log.cpp|h

Move GUI-related globals to clientlauncher

Move g_settings and g_settings_path to settings.cpp|h

Move g_menuclouds to clouds.cpp|h

Move g_profiler to profiler.cpp|h

Move texture_min_size even further down the pipe. Now, textures are JIT-upscaled using an image transformation, right at the time they're added to a mesh or particle; images used in 2D elements are left unscaled. This should fix any remaining issues with HUD elements.

For usages of assert() that are meant to persist in Release builds (when NDEBUG is defined), replace those usages with persistent alternatives

SAO work: ActiveObject types & SAO cleanup * Replace u8 types with ActiveObjectType. * Merge content_object.h into activeobject.h * Remove DummyLoadSAO, it's now unused. * Remove ItemSAO, it's also unused

- Don't create and cache an extruded mesh for every (non-node) item.
  Instead use a single one per image resolution.

- For cubic nodes reuse a single wield mesh too

- Improve lighting of the wielded item

- Increase far value of wield mesh scene camera, fixes #1770

- Also includes some minor refactorings of Camera and GenericCAO.

This also cleans up settings a bit