[F] multiple fixes

Loading the extension makes sure that no other version is running
Improved moving objects by keyboard arrows when pressing the Control key
The uninstaller makes sure that the extension folder is deleted

.gitattributes

@@ -4,7 +4,7 @@
 *.html linguist-detectable=true
 *.json linguist-detectable=true
 
-# Set default behaviour, in case users don't have core.autocrlf set.
+# Set default behaviour, in case users don't have core.autoLF set.
 * text=auto
 
 # Explicitly declare text files we want to always be normalized and converted
@@ -15,13 +15,13 @@
 *.html text
 
 # Declare files that will always have LF line endings on checkout.
-*.json text eol=CRLF
-*.livecodescript text eol=CRLF
-*.livecodescript text eol=CRLF
-*.html text eol=CRLF
+*.json text eol=LF
+*.livecodescript text eol=LF
+*.livecodescript text eol=LF
+*.html text eol=LF
 
-# These files are processed by cygwin+bash so make sure they don't end with CRLF
-prebuilt/versions/* text eol=CRLF
+# These files are processed by cygwin+bash so make sure they don't end with LF
+prebuilt/versions/* text eol=LF
 
 # Denote all files that are truly binary and should not be modified.
 *.png binary