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/hashtable.c

@@ -0,0 +1,12 @@
+#include <bshell/format.h>
+
+static struct bshell_table_column hashtable_table_columns[] = {
+	TABLE_COLUMN("key", "key", 37),
+	TABLE_COLUMN("value", "value", COL_WIDTH_INFINITE),
+};
+
+struct bshell_table hashtable_bshell_table = {
+	.fmt_columns = hashtable_table_columns,
+	.fmt_column_count
+	= sizeof hashtable_table_columns / sizeof hashtable_table_columns[0],
+};