include textile 2.5.0 as submodule
initial backport from gregors r5 optgroup patch
fix method name..
patch rex_var_value to json_encode arrays ..
add PHP < 5.2 json_encode() replacement function from http://pear.php.net/package/Services_JSON/
funcs & class include in separate file ..
use serialize() instead json_encode() .. dump json compat layer
add toArray() method
initial patch version
recode as suggested by @staabm  in https://github.com/redaxo/redaxo/pull/155#discussion_r1913479
make param string case independent as suggested by @gharlan in https://github.com/redaxo/redaxo/pull/155#discussion_r1913602
case independent URL param as suggested by @Koala in https://github.com/redaxo/redaxo/pull/155#discussion_r2342434
Merge pull request #74 from jdlx/core/rex_select/optgroup_backport

[rex select] optgroup backport (fixes #39)
added parameter to subclass
Merge pull request #75 from jdlx/core/rex_value_array_to_json

[REX_VALUE] array handling (fixes #66)
Merge pull request #76 from jdlx/core/rex_list/initial_sort_direction_patch

[rex_list] Spaltensortierung beliebig einstellbar (reopened)
check PHP version @ install..
don't execute cronjobs after every edit
added iso support
updated textile to 2.5.1