I18N - Sample strings files, header

- Began proposed format for strings file.
- Began corresponding header file for string IDs.

i18n/strings.en-US

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+# This is an example strings.en-US file.
+#
+# The task program has a built-in set of default strings, which are UTF8 encoded
+# for the en-US locale.  A file such as this is used to override those defaults.
+# This means that a strings file is merely a delta applied to the built-in
+# strings, so an empty string file means you get en-US.
+#
+# To use another string file, add the following entry to your .taskrc file:
+#
+#   locale=sv-SE    # Swedish string set
+
+# 1xx task shell
+100 Unknown Error.
+
+# 2xx Commands
+200 active
+201 add
+202 append
+203 annotate
+204 calendar
+205 colors
+206 completed
+207 delete
+208 done
+209 duplicate
+210 edit
+211 export
+212 help
+213 history
+214 ghistory
+215 import
+216 info
+217 next
+218 overdue
+219 projects
+220 start
+221 stats
+222 stop
+223 summary
+224 tags
+225 timesheet
+226 undelete
+227 undo
+228 version
+
+# 3xx Attributes
+300 project
+301 priority
+302 fg
+303 bg
+304 due
+305 entry
+306 start
+307 end
+308 recur
+309 until
+310 mask
+311 imask
+
+# 4xx Columns
+
+# 5xx Colors
+500 bold
+501 underline
+502 bold_underline
+503 black
+504 red
+505 green
+506 yellow
+507 blue
+508 magenta
+509 cyan
+510 white
+511 bold_black
+512 bold_red
+513 bold_green
+514 bold_yellow
+515 bold_blue
+516 bold_magenta
+517 bold_cyan
+518 bold_white
+519 underline_black
+520 underline_red
+521 underline_green
+522 underline_yellow
+523 underline_blue
+524 underline_magenta
+525 underline_cyan
+526 underline_white
+527 bold_underline_black
+528 bold_underline_red
+529 bold_underline_green
+530 bold_underline_yellow
+531 bold_underline_blue
+532 bold_underline_magenta
+533 bold_underline_cyan
+534 bold_underline_white
+535 on_black
+536 on_red
+537 on_green
+538 on_yellow
+539 on_blue
+540 on_magenta
+541 on_cyan
+542 on_white
+543 on_bright_black
+544 on_bright_red
+545 on_bright_green
+546 on_bright_yellow
+547 on_bright_blue
+548 on_bright_magenta
+549 on_bright_cyan
+550 on_bright_white
+
+# 6xx Config
+
+# 7xx TDB
+
+# 8xx Reports
+