make GET /api/ return current permissions

This is useful for e.g. deciding whether or not to present the user
admin UI in navigation.

As part of this change, I adjusted the casing in Permissions, and then
all the toml stuff for consistency. Noted in changelog.

guide/build.md

@@ -295,11 +295,11 @@ You'll also need a `/etc/moonfire-nvr.toml`:
 ```toml
 [[binds]]
 ipv4 = "0.0.0.0:8080"
-allow_unauthenticated_permissions = { view_video = true }
+allowUnauthenticatedPermissions = { viewVideo = true }
 
 [[binds]]
 unix = "/var/lib/moonfire-nvr/sock"
-own_uid_is_privileged = true
+ownUidIsPrivileged = true
 ```
 
 Note this configuration is insecure. You can change that via replacing the

guide/install.md

@@ -71,11 +71,11 @@ $ sudo chmod a+rx /usr/local/bin/nvr
 ```toml
 [[binds]]
 ipv4 = "0.0.0.0:8080"
-allow_unauthenticated_permissions = { view_video = true }
+allowUnauthenticatedPermissions = { viewVideo = true }
 
 [[binds]]
 unix = "/var/lib/moonfire-nvr/sock"
-own_uid_is_privileged = true
+ownUidIsPrivileged = true
 ```
 
 `/usr/local/bin/nvr`:

guide/secure.md

@@ -165,13 +165,13 @@ If you follow the recommended Docker setup, your `/etc/moonfire-nvr.json`
 will contain this line:
 
 ```toml
-allow_unauthenticated_permissions = { view_video = true }
+allowUnauthenticatedPermissions = { viewVideo = true }
 ```
 
 Replace it with the following:
 
 ```toml
-trust_forward_headers = true
+trustForwardHeaders = true
 ```
 
 This change has two effects: