Implement many more nodes

Adds these new styling and formatting nodes
* strike
* highlight
* linebreaks
* pagebreaks
* Hyperlinks

lib/notare/style.rb

@@ -2,18 +2,24 @@
 
 module Notare
   class Style
-    attr_reader :name, :bold, :italic, :underline, :color, :size, :font,
+    attr_reader :name, :bold, :italic, :underline, :strike, :highlight, :color, :size, :font,
                 :align, :indent, :spacing_before, :spacing_after
 
     ALIGNMENTS = %i[left center right justify].freeze
+    HIGHLIGHT_COLORS = %w[
+      black blue cyan darkBlue darkCyan darkGray darkGreen darkMagenta
+      darkRed darkYellow green lightGray magenta red white yellow
+    ].freeze
 
-    def initialize(name, bold: nil, italic: nil, underline: nil, color: nil,
-                   size: nil, font: nil, align: nil, indent: nil,
-                   spacing_before: nil, spacing_after: nil)
+    def initialize(name, bold: nil, italic: nil, underline: nil, strike: nil,
+                   highlight: nil, color: nil, size: nil, font: nil, align: nil,
+                   indent: nil, spacing_before: nil, spacing_after: nil)
       @name = name
       @bold = bold
       @italic = italic
       @underline = underline
+      @strike = strike
+      @highlight = validate_highlight(highlight)
       @color = normalize_color(color)
       @size = size
       @font = font
@@ -36,7 +42,7 @@ module Notare
     end
 
     def text_properties?
-      !!(bold || italic || underline || color || size || font)
+      !!(bold || italic || underline || strike || highlight || color || size || font)
     end
 
     # Size in half-points for OOXML (14pt = 28 half-points)
@@ -61,5 +67,14 @@ module Notare
 
       raise ArgumentError, "Invalid alignment: #{align}. Use #{ALIGNMENTS.join(", ")}"
     end
+
+    def validate_highlight(highlight)
+      return nil if highlight.nil?
+
+      color = highlight.to_s
+      return color if HIGHLIGHT_COLORS.include?(color)
+
+      raise ArgumentError, "Invalid highlight color: #{highlight}. Use one of: #{HIGHLIGHT_COLORS.join(", ")}"
+    end
   end
 end