Implement configuration handling

This patch implements basic configuration handling that reads a
configuration file and stores the parsed data in the ExecCtx and RunCtx
structs.  It supports three configuration items:
- model (previously only --model)
- no_cache (previously only NITROCLI_NO_CACHE)
- verbosity (previously only --verbose)

1 files changed, 7 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index fcc1a6d..23602ec 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -58,10 +58,17 @@ version = "0.2"
 [dependencies.nitrokey]
 version = "0.7.1"
 
+[dependencies.serde]
+version = "1.0"
+features = ["derive"]
+
 [dependencies.structopt]
 version = "0.3.7"
 default-features = false
 
+[dependencies.toml]
+version = "0.5.6"
+
 [dev-dependencies.nitrokey-test]
 version = "0.4"