Prefix variables to add user defined static symbols

[XelorR]

#51
Implemented following variables:

hydro_prefix_beginning
hydro_prefix_git
hydro_prefix_pwd
hydro_prefix_duration

hydro_prefix_beginning can be colored with new introduced color variable: hydro_color_beginning

It is possible to add user-defined static text to prepend blocks, like this:

set --global hydro_multiline true

set --global hydro_color_prompt 94e2d5
set --global hydro_color_error f38ba8
set --global hydro_color_pwd b4befe
set --global hydro_color_git f9e2af
set --global hydro_color_duration 94e2d5
#set --global hydro_color_beginning 94e2d5

set --global hydro_prefix_beginning \n"$os_icon "
set --global hydro_prefix_git " "
set --global hydro_prefix_pwd " "
set --global hydro_prefix_duration "󰅐 "

[jorgebucaran]

Thanks, @XelorR! 👀