api: remove _t suffix from x265_param in comments

--HG--
extra : rebase_source : 0676c9fd4a434ebd8e32329f845041be26afcf5f
api: remove mention of x265_encoder_reconfig(), which doesn't yet exist

--HG--
extra : rebase_source : f63952ce127a2db00d264b7abf7020cb2c1608bd
api: tpyo

--HG--
extra : rebase_source : 9ed1ee91b9b382e8a760ffb4a95fcd11b9a3e306
api: moar tpyo

--HG--
extra : rebase_source : 5babef414b8538380b1847f86c10f32bef317437
api: even moar

--HG--
extra : rebase_source : a68339a3cdb9a4cba8e0252dee46c1e889062999
rest: add a note to the tune documentation about using --tune ssim/psnr

--HG--
extra : rebase_source : 45ff73b650eb83e3aab8c5eb0716809183b5da53
rest: add API docs with links to appropriate sections

--HG--
extra : rebase_source : cc5a6bbcfe39341ff22680f327319bad3b66dd17
rest: fix typo
reduce xModeBitsIntra() call
ratecontrol: do not low-clip first I frame with ABR
refine intra reference samples
fix 4:2:2 coeff rate calc
checked: convert a pile of asserts() into optional runtime checks
TEncSearch: remove unused (and shadowed) variable
cleanup clear()
check: another pile of assert->X265_CHECK conversions

--HG--
extra : amend_source : 4987c8157aa5b795898977aa94f2521d4a17d601
check: fix MSVC warnings and check behavior
check: disable MSVC warnings about constant conditionals with checked builds
checked: enable check macros in debug builds
cli: remove default strings for preset and tune, modify default AQ mode to match

The cli has used --tune ssim as the default since we've had an ssim tune, but
API users were getting the default aq-mode of 1 instead.  This commit removes
the default tune (and preset) strings and fixes the default param structure to
match the previous CLI default behavior (aq-mode 2)