Add BorderLeft and Border Right Support based on direction

.BorderLeft(@value) when (@direction = @ltr) {
    border-left: @value;
}
.BorderLeft(@value) when (@direction = @rtl) {
    border-right: @value;
}
.BorderRight(@value) when (@direction = @ltr) {
    border-right: @value;
}
.BorderRight(@value) when (@direction = @rtl) {
    border-left: @value;
}