bshell: re-organise build into three separate components

bshell: the front-end binary
bshell.runtime: contains the parser, compiler, and classes needed to run bshell scripts
bshell.core: contains the builtin commandlets and aliases

bshell.runtime/format/command.c

@@ -0,0 +1,14 @@
+#include <bshell/format.h>
+
+static struct bshell_table_column command_table_columns[] = {
+	TABLE_COLUMN("command_type", "command_type", 13),
+	TABLE_COLUMN("name", "name", COL_WIDTH_INFINITE),
+	TABLE_COLUMN("version", "version", 12),
+	TABLE_COLUMN("source", "source", 35),
+};
+
+struct bshell_table command_bshell_table = {
+	.fmt_columns = command_table_columns,
+	.fmt_column_count
+	= sizeof command_table_columns / sizeof command_table_columns[0],
+};