systemd-boot: Make automatic entries configurable

Hiding automatic entries allows for giving custom entry names like
"Windows 10" instead of "Windows Boot Manager" by creating an appropriate
loader file in the loader/entries folder.
Note that it is already doable by renaming bootmgfw.efi (or the other auto-detected
boot loaders) and then using the renamed file for a custom entry. But windows will
automatically recreate the boot loader on updates, including the default EFI
bootloader entry if that one is missing.

Make hiding EFI reboot a separate option because there is no simple way to create
it with a custom loader entry and people may still want that around while still
hiding the other auto entries.

Also, turn no_editor into a positive boolean name while we're touching this code.

src/shared/bootspec.c

@@ -142,6 +142,8 @@ void boot_config_free(BootConfig *config) {
         free(config->default_pattern);
         free(config->timeout);
         free(config->editor);
+        free(config->auto_entries);
+        free(config->auto_firmware);
 
         free(config->entry_oneshot);
         free(config->entry_default);
@@ -194,6 +196,10 @@ int boot_loader_read_conf(const char *path, BootConfig *config) {
                         r = free_and_strdup(&config->timeout, p);
                 else if (streq(buf, "editor"))
                         r = free_and_strdup(&config->editor, p);
+                else if (streq(buf, "auto-entries"))
+                        r = free_and_strdup(&config->auto_entries, p);
+                else if (streq(buf, "auto-firmware"))
+                        r = free_and_strdup(&config->auto_firmware, p);
                 else {
                         log_notice("%s:%u: Unknown line \"%s\"", path, line, buf);
                         continue;