[BUGFIX] FileLogWriter ignores log file configuration

If there are several instances of TYPO3\CMS\Core\Log\Writer\FileLogWriter
with different log files configured in $logFile, all log records end up
in one file.

This is caused by improper use of static variable $logFileHandle.
All filehandles except the one of the latest instance are ignored.

Resolves: #48918
Releases: 6.2, 6.1, 6.0
Change-Id: Ie6de5e4789d107b541117daf6c7e9855015e0a46
Reviewed-on: https://review.typo3.org/21258
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel
Reviewed-by: Markus Klein
Tested-by: Markus Klein
[TASK] Move JavaScript files out of t3lib

t3lib folder should diminish and finally dissolve itself.
Moves JS files out of t3lib to corresponding extension folders.

Change-Id: Iffdbd1a919dadae923034d38dedafa68a902da26
Resolves: #48379
Releases: 6.2
Reviewed-on: https://review.typo3.org/20903
Tested-by: Wouter Wolters
Reviewed-by: Wouter Wolters
Reviewed-by: Markus Klein
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
[BUGFIX] Bad English in system extensions: "screen shot"

According to wiktionary [1] the word "screenshot" is a compound
word and not two separate words.

[1] http://en.wiktionary.org/wiki/screenshot

Resolves: #48989
Releases: 6.2, 6.1
Change-Id: Id7b9aa7eb98c4a2c6b0d47bddfb7cb9d51580aec
Reviewed-on: https://review.typo3.org/21296
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Alexander Opitz
Tested-by: Alexander Opitz
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
[TASK] Remove "require_once" in /typo3/

During the namespace switch many classes were renamed
and moved to different locations based on the new names.

This patch removes the "require_once" statements that are
automatically resolved and auto loaded in makeInstance.

Change-Id: I5f788fad6ea63b2aa0b9f33e3d068b93ec04dc31
Resolves: #48934
Releases: 6.2
Reviewed-on: https://review.typo3.org/21283
Reviewed-by: Philipp Gampe
Reviewed-by: Wouter Wolters
Reviewed-by: Susanne Moog
Tested-by: Susanne Moog
Reviewed-by: Oliver Klee
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Merge remote-tracking branch 'origin/master' into 7elix-master