fmt: new package

Signed-off-by: Semyon Kolganov <semenak94@mail.ru>
[Thomas:
 - add entry to DEVELOPERS file
 - add missing wchar dependency
 - minor tweaks.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
diff --git a/package/Config.in b/package/Config.in
index fe4c0ae..a4855a9 100644
--- a/package/Config.in
+++ b/package/Config.in
@@ -1433,6 +1433,7 @@
 menu "Text and terminal handling"
 	source "package/augeas/Config.in"
 	source "package/enchant/Config.in"
+	source "package/fmt/Config.in"
 	source "package/icu/Config.in"
 	source "package/libcli/Config.in"
 	source "package/libedit/Config.in"