lib: HTML clear children before each render to avoid duplicates

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
lib: added init.from in array and hashset

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
lib: added 'slice' method to List

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
tests: fix base_virtual_type3 for new model

Signed-off-by: Jean Privat <jean@pryen.org>
Merge remote-tracking branch 'alexandre/libhtml'