Adds file with color variables (#30)

According to #29 aliases are much slower since you need a subshell to print each color.

lib/UI/Color.var.sh

@@ -0,0 +1,155 @@
+alias UI.Color.IsAvailable='[ $(tput colors 2>/dev/null || echo 0) -ge 16 ] && [ -t 1 ]'
+if UI.Color.IsAvailable
+then
+  UI_Color_Default=$'\033[0m'
+
+  UI_Color_Black=$'\033[0;30m'
+  UI_Color_Red=$'\033[0;31m'
+  UI_Color_Green=$'\033[0;32m'
+  UI_Color_Yellow=$'\033[0;33m'
+  UI_Color_Blue=$'\033[0;34m'
+  UI_Color_Magenta=$'\033[0;35m'
+  UI_Color_Cyan=$'\033[0;36m'
+  UI_Color_LightGray=$'\033[0;37m'
+
+  UI_Color_DarkGray=$'\033[0;90m'
+  UI_Color_LightRed=$'\033[0;91m'
+  UI_Color_LightGreen=$'\033[0;92m'
+  UI_Color_LightYellow=$'\033[0;93m'
+  UI_Color_LightBlue=$'\033[0;94m'
+  UI_Color_LightMagenta=$'\033[0;95m'
+  UI_Color_LightCyan=$'\033[0;96m'
+  UI_Color_White=$'\033[0;97m'
+
+  # flags
+  UI_Color_Bold=$'\033[1m'
+  UI_Color_Dim=$'\033[2m'
+  UI_Color_Italics=$'\033[3m'
+  UI_Color_Underline=$'\033[4m'
+  UI_Color_Blink=$'\033[5m'
+  UI_Color_Invert=$'\033[7m'
+  UI_Color_Invisible=$'\033[8m'
+
+  UI_Color_NoBold=$'\033[21m'
+  UI_Color_NoDim=$'\033[22m'
+  UI_Color_NoItalics=$'\033[23m'
+  UI_Color_NoUnderline=$'\033[24m'
+  UI_Color_NoBlink=$'\033[25m'
+  UI_Color_NoInvert=$'\033[27m'
+  UI_Color_NoInvisible=$'\033[28m'
+else
+  UI_Color_Default=""
+
+  UI_Color_Black=""
+  UI_Color_Red=""
+  UI_Color_Green=""
+  UI_Color_Yellow=""
+  UI_Color_Blue=""
+  UI_Color_Magenta=""
+  UI_Color_Cyan=""
+  UI_Color_LightGray=""
+
+  UI_Color_DarkGray=""
+  UI_Color_LightRed=""
+  UI_Color_LightGreen=""
+  UI_Color_LightYellow=""
+  UI_Color_LightBlue=""
+  UI_Color_LightMagenta=""
+  UI_Color_LightCyan=""
+  UI_Color_White=""
+
+  # flags
+  UI_Color_Bold=""
+  UI_Color_Dim=""
+  UI_Color_Italics=""
+  UI_Color_Underline=""
+  UI_Color_Blink=""
+  UI_Color_Invert=""
+  UI_Color_Invisible=""
+
+  UI_Color_NoBold=""
+  UI_Color_NoDim=""
+  UI_Color_NoItalics=""
+  UI_Color_NoUnderline=""
+  UI_Color_NoBlink=""
+  UI_Color_NoInvert=""
+  UI_Color_NoInvisible=""
+fi
+
+alias UI.Powerline.IsAvailable="UI.Color.IsAvailable && test -z \$NO_UNICODE && (echo -e $'\u1F3B7' | grep -v F3B7) &> /dev/null"
+if UI.Powerline.IsAvailable
+then
+  UI_Powerline_PointingArrow=$'\u27a1'
+  UI_Powerline_ArrowLeft=$'\ue0b2'
+  UI_Powerline_ArrowRight=$'\ue0b0'
+  UI_Powerline_ArrowRightDown=$'\u2198'
+  UI_Powerline_ArrowDown=$'\u2B07'
+  UI_Powerline_PlusMinus=$'\ue00b1'
+  UI_Powerline_Branch=$'\ue0a0'
+  UI_Powerline_RefersTo=$'\u27a6'
+  UI_Powerline_OK=$'\u2714'
+  UI_Powerline_Fail=$'\u2718'
+  UI_Powerline_Lightning=$'\u26a1'
+  UI_Powerline_Cog=$'\u2699'
+  UI_Powerline_Heart=$'\u2764'
+
+  # colorful
+  UI_Powerline_Star=$'\u2b50'
+  UI_Powerline_Saxophone=$'\U1F3B7'
+  UI_Powerline_ThumbsUp=$'\U1F44D'
+else
+  UI_Powerline_PointingArrow="'~'"
+  UI_Powerline_ArrowLeft="'<'"
+  UI_Powerline_ArrowRight="'>'"
+  UI_Powerline_ArrowRightDown="'>'"
+  UI_Powerline_ArrowDown="'_'"
+  UI_Powerline_PlusMinus="'+-'"
+  UI_Powerline_Branch="'|}'"
+  UI_Powerline_RefersTo="'*'"
+  UI_Powerline_OK="'+'"
+  UI_Powerline_Fail="'x'"
+  UI_Powerline_Lightning="'!'"
+  UI_Powerline_Cog="'{*}'"
+  UI_Powerline_Heart="'<3'"
+
+  # colorful
+  UI_Powerline_Star="'*''"
+  UI_Powerline_Saxophone="'(YEAH)'"
+  UI_Powerline_ThumbsUp="'(OK)'"
+fi
+
+UI.Color.Print() {
+  local -i colorCode="$1"
+
+  if UI.Color.IsAvailable
+  then
+    local colorString="\$'\033[${colorCode}m'"
+    eval echo "${colorString}"
+  else
+    echo
+  fi
+}
+
+UI.Color.256text() {
+  local -i colorNumber="$1"
+
+  if UI.Color.IsAvailable
+  then
+    local colorString="\$'\033[38;5;${colorNumber}m'"
+    eval echo "${colorString}"
+  else
+    echo
+  fi
+}
+
+UI.Color.256background() {
+  local -i colorNumber="$1"
+
+  if UI.Color.IsAvailable
+  then
+    local colorString="\$'\033[48;5;${colorNumber}m'"
+    eval echo "${colorString}"
+  else
+    echo
+  fi
+}