Move to SPDX licenses (#449)

* Move to SPDX licenses

Found a way to do this without breaking API compat, so here it is, instead of waiting for v3

Resolves MOD-129
Resolves #396

* License URL updates

* what was I thinking

* Do a thing

* Add open source filter

* Remove dead imports

* Borrow

* Update 20220910132835_spdx-licenses.sql

* Add license text route

* Update migration

* Address comments

src/routes/project_creation.rs

@@ -688,16 +688,16 @@ pub async fn project_create_inner(
             )
         })?;
 
-        let license_id = models::categories::License::get_id(
+        let license_id = spdx::Expression::parse(
             &project_create_data.license_id,
-            &mut *transaction,
         )
-        .await?
-        .ok_or_else(|| {
-            CreateError::InvalidInput(
-                "License specified does not exist.".to_string(),
-            )
+        .map_err(|err| {
+            CreateError::InvalidInput(format!(
+                "Invalid SPDX license identifier: {}",
+                err
+            ))
         })?;
+
         let mut donation_urls = vec![];
 
         if let Some(urls) = &project_create_data.donation_urls {
@@ -744,7 +744,7 @@ pub async fn project_create_inner(
             status: status_id,
             client_side: client_side_id,
             server_side: server_side_id,
-            license: license_id,
+            license: license_id.to_string(),
             slug: Some(project_create_data.slug),
             donation_urls,
             gallery_items: gallery_urls