[#2] Removing empty files.

These files were empty. They may have been in the plan, but never got
implemented. They can be added back when they are actually implementing
something.

src/line.rs

@@ -1,3 +0,0 @@
-// SPDX-License-Identifier: Apache-2.0
-// Sealed with Magistamp.
-

src/plane.rs

@@ -1,3 +0,0 @@
-// SPDX-License-Identifier: Apache-2.0
-// Sealed with Magistamp.
-

src/point.rs

@@ -1,3 +0,0 @@
-// SPDX-License-Identifier: Apache-2.0
-// Sealed with Magistamp.
-

src/ray.rs

@@ -1,3 +0,0 @@
-// SPDX-License-Identifier: Apache-2.0
-// Sealed with Magistamp.
-