calc functions and zxq5 logo in fetch

- changed the crystalfetch text
- added functions to the calculator

Cargo.lock

@@ -15,6 +15,7 @@ dependencies = [
  "futures-util",
  "hashbrown",
  "lazy_static",
+ "libm",
  "linked_list_allocator",
  "pc-keyboard",
  "pic8259",
@@ -192,6 +193,12 @@ dependencies = [
  "spin",
 ]
 
+[[package]]
+name = "libm"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7012b1bbb0719e1097c47611d3898568c546d597c2e74d66f6087edd5233ff4"
+
 [[package]]
 name = "linked_list_allocator"
 version = "0.10.5"