Added background option

Allows the user to configure whether the theme's background color is displayed

data/micro.json

@@ -21,6 +21,11 @@
             "type": "boolean",
             "default": false
         },
+        "background": {
+            "description": "Whether to display the theme's background color\nhttps://github.com/zyedidia/micro/blob/master/runtime/help/options.md#options",
+            "type": "boolean",
+            "default": false
+        },
         "backup": {
             "description": "Whether to backup all open buffers\nhttps://github.com/zyedidia/micro/blob/master/runtime/help/options.md#options",
             "type": "boolean",

internal/action/command.go

@@ -584,7 +584,7 @@ func doSetGlobalOptionNative(option string, nativeValue interface{}) error {
 	config.ModifiedSettings[option] = true
 	delete(config.VolatileSettings, option)
 
-	if option == "colorscheme" {
+	if option == "colorscheme" || option == "background" {
 		// LoadSyntaxFiles()
 		config.InitColorscheme()
 		for _, b := range buffer.OpenBuffers {

internal/config/colorscheme.go

@@ -137,6 +137,11 @@ lineLoop:
 			colors := string(matches[2])
 
 			style := StringToStyle(colors)
+
+			if !GlobalSettings["background"].(bool) && link != "statusline" {
+				style = style.Background(tcell.ColorDefault)
+			}
+
 			c[link] = style
 
 			if link == "default" {

internal/config/settings.go

@@ -54,6 +54,7 @@ var OptionChoices = map[string][]string{
 var defaultCommonSettings = map[string]interface{}{
 	"autoindent":      true,
 	"autosu":          false,
+	"background":      true,
 	"backup":          true,
 	"backupdir":       "",
 	"basename":        false,

runtime/help/options.md

@@ -32,6 +32,12 @@ Here are the available options:
 
     default value: `false`
 
+* `background`: Whether to display the current theme's background color.
+   If this option is disabled, the background color of the current theme
+   will not be used and instead the terminal's default color will be shown.
+
+    default value: `true`
+
 * `backup`: micro will automatically keep backups of all open buffers. Backups
    are stored in `~/.config/micro/backups` and are removed when the buffer is
    closed cleanly. In the case of a system crash or a micro crash, the contents