syscall work, rename syscall to sysvar, rename current to clock (#5074)

* syscall work, rename syscall to sysvar, rename current to clock

* missed one

* nit

sdk/src/sysvar/mod.rs

@@ -0,0 +1,21 @@
+//! named accounts for synthesized data accounts for bank state, etc.
+//!
+use crate::pubkey::Pubkey;
+
+pub mod clock;
+pub mod fees;
+pub mod rewards;
+pub mod slot_hashes;
+
+pub fn is_sysvar_id(id: &Pubkey) -> bool {
+    clock::check_id(id) || fees::check_id(id) || rewards::check_id(id) || slot_hashes::check_id(id)
+}
+
+/// "Sysvar1111111111111111111111111111111111111"
+///   owner pubkey for sysvar accounts
+const ID: [u8; 32] = [
+    6, 167, 213, 23, 24, 117, 247, 41, 199, 61, 147, 64, 143, 33, 97, 32, 6, 126, 216, 140, 118,
+    224, 140, 40, 127, 193, 148, 96, 0, 0, 0, 0,
+];
+
+crate::solana_name_id!(ID, "Sysvar1111111111111111111111111111111111111");