v2.19.0

What's Changed

• fix: misc batch issues by @pateljannat in #1226
• refactor: duration field in quiz should be in minutes by @pateljannat in #1230
• refactor: fetch minimal information for batch cards by @pateljannat in #1231
• fix: misc issues by @pateljannat in #1232
• feat: student activities display in a heatmap by @pateljannat in #1234
• fix: fix issue where assignment form is popped up on add quiz button in Lesson Edit form by @FahidLatheef in #1235
• fix: replaced days_diff with date_diff for v15 compatibility by @FahidLatheef in #1236

Full Changelog: v2.18.0...v2.19.0