Added ex buffer commands ':bp' and ':bn' for switching tabs.
Added ex buffer commands ':bp' and ':bn' for switching tabs.

wbcustc/Vintageous,himacro/Vintageous,wbcustc/Vintageous,denim2x/Vintageous,vastcharade/Vintageous,xushuwei202/Vintageous,zhangtuoparis13/Vintageous,wbcustc/Vintageous,himacro/Vintageous,denim2x/Vintageous,vastcharade/Vintageous,himacro/Vintageous,zhangtuoparis13/Vintageous,guillermooo-forks/Vintageous,zhangtuoparis13/Vintageous,gerardroche/Vintageous,denim2x/Vintageous,guillermooo-forks/Vintageous,guillermooo-forks/Vintageous,xushuwei202/Vintageous,xushuwei202/Vintageous