efl_ui/layout_base: add "finger_size_multiplier" property
Summary:
this feature is set on objects which inherit from layout_base in order to
allow automatically application of variable finger sizes based on a
widget's needs
an example of this would be a calendar, which is 7:8 fingers
this functionality is disabled by passing 0,0 as the property
@feature
Depends on D9436
Reviewers: bu5hm4n
Reviewed By: bu5hm4n
Subscribers: segfaultxavi, cedric, #reviewers, #committers
Tags: #efl_widgets
Maniphest Tasks: T8059
Differential Revision: https://phab.enlightenment.org/D9437