Print documentation in default config

[GlowingScrewdriver]

This change causes wl-kbptr --help-config to print comments containing descriptions for all fields and sections in the default config. Since --help-config prints an exhaustive list of all config fields and sections, what is printed is effectively full documentation on configuration.

May fix #50

[GlowingScrewdriver]

I've opened this PR as a draft, since the descriptions themselves aren't complete. Apart from that, the code changes are ready for review.

At present, the difference in the default config looks like this:

Details

diff --git a/config.old b/config.new
index 9d6dbac..7c1fc33 100644
--- a/config.old
+++ b/config.new
@@ -4,53 +4,139 @@
 # be loaded if it exits. Below is the default configuration.
 
 [general]
+## General configuration ##
+# Home row keys
 home_row_keys=
+
+# Modes to use
 modes=tile,bisect
+
+# Status code to exit with when cancelled
 cancellation_status_code=0
 
+
 [mode_tile]
+## Configuration for tile mode ##
+# Label color
 label_color=#fffd
+
+# Selected label color
 label_select_color=#fd0d
+
+# Background color for unselectable
 unselectable_bg_color=#2226
+
+# Background color for selectable
 selectable_bg_color=#0304
+
+# Border color for selectable
 selectable_border_color=#040c
+
+# Font family for label
 label_font_family=sans-serif
+
+# Font size for label
 label_font_size=8 50% 100
+
+# Symbols to use for labels
 label_symbols=abcdefghijklmnopqrstuvwxyz
 
+
 [mode_floating]
+## Configuration for floating mode ##
+# Source
 source=stdin
+
+# Color of labels
 label_color=#fffd
+
+# Selected label color
 label_select_color=#fd0d
+
+# Background color of unselectable
 unselectable_bg_color=#2226
+
+# Background color of selectable
 selectable_bg_color=#1718
+
+# Border color of selectable
 selectable_border_color=#040c
+
+# Font family for label
 label_font_family=sans-serif
+
+# Font size for label
 label_font_size=12 50% 100
+
+# Symbols to use for labels
 label_symbols=abcdefghijklmnopqrstuvwxyz
 
+
 [mode_bisect]
+## Configuration for bisect mode ##
+# Label color
 label_color=#fffd
+
+# Font size for labels
 label_font_size=20
+
+# Font family for labels
 label_font_family=sans-serif
+
+# Padding for labels
 label_padding=12
+
+# Pointer size
 pointer_size=20
+
+# Pointer color
 pointer_color=#e22d
+
+# Background color for unselectable
 unselectable_bg_color=#2226
+
+# Background color for even area
 even_area_bg_color=#0304
+
+# Border color for even area
 even_area_border_color=#0408
+
+# Background color for odd area
 odd_area_bg_color=#0034
+
+# Border color for odd area
 odd_area_border_color=#0048
+
+# Border color for history
 history_border_color=#3339
 
+
 [mode_split]
+## Configuration for split mode ##
+# Pointer size
 pointer_size=20
+
+# Pointer color
 pointer_color=#e22d
+
+# Background color
 bg_color=#2226
+
+# Background color for area
 area_bg_color=#11111188
+
+# Color for vertical marker
 vertical_color=#8888ffcc
+
+# Color for horizontal marker
 horizontal_color=#008800cc
+
+# Border color for history
 history_border_color=#3339
 
+
 [mode_click]
+## Configuration for click mode ##
+# Mouse button
 button=left
+

[moverest]

That looks great! If I was to nitpick, I'd have the description for the section before it like the rest but honestly it's fine.

[GlowingScrewdriver]

@moverest descriptions are mostly ready, and I've moved the comments before the section like you suggested.

[moverest]

It would make sense to explain this one with more details. See #6.

[GlowingScrewdriver]

Done

[moverest]

Suggested change

	"Modes to use; will be chained"
	"Modes (tile, bisect, split or float) to use; will be chained."

[GlowingScrewdriver]

Done

[GlowingScrewdriver]

Apologies for the long silence -- my day job caught up.

I've filled in the remaining descriptions. I've also introduced a helper (print_comment) to print multi-line comments, since some of the descriptions ended up being rather long.